tools:iio:iio_event_monitor: save right errno

Move up error handling code to preserve the errno coming from ioctl(),
before it may be changed by close().

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index f6fdab4..578390d 100644 (file)
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -275,15 +275,17 @@ int main(int argc, char **argv)
        }
 
        ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
-
-       close(fd);
-
        if (ret == -1 || event_fd == -1) {
                ret = -errno;
                fprintf(stdout, "Failed to retrieve event fd\n");
+               if (close(fd) == -1)
+                       perror("Failed to close character device file");
+
                goto error_free_chrdev_name;
        }
 
+       close(fd);
+
        while (true) {
                ret = read(event_fd, &event, sizeof(event));
                if (ret == -1) {